Sea slugs including nudibranchs. Part 18 of my documentary, "Mucky Secrets", about the fascinating marine creatures of the Lembeh Strait in Indonesia. Watch the full 90-minute documentary at    • Mucky Secrets (full) - The Marine Cre...  

A huge and fascinating diversity of sea slugs, or opisthobranchs (Opisthobranchia), are found in the Lembeh Strait. Opisthobranch means "gills behind", because their gills are located behind their heart.

Most sea slugs have all but lost their protective shell, but compensate with more advanced weapons of defence.

Over six thousand different species of sea slug are nudibranchs (Nudibranchia). The name means "naked gills", referring to the rosette of branchial plumes on their back, surrounding their anus. These gills vary greatly in form, but all have a large surface area for oxygen exchange.

There are English captions showing either the full narration or the common and scientific names of the marine life, along with the dive site names.

The full Mucky Secrets nature documentary features a huge diversity of weird and wonderful marine animals including frogfish, nudibranchs, scorpionfish, crabs, shrimps, moray eels, seahorses, octopus, cuttlefish etc..

Thanks to Jaycieh (  / jaycieh  ) for the music track, "The Unknown" and to Kevin MacLeod of http://www.incompetech.com for the music track, "Brittle Rille", which is licensed under a Creative Commons Attribution 3.0 Unported license.

Thanks to the staff and keen-eyed divemasters of Two Fish Divers (http://www.twofishdivers.com), for accommodation, diving services and critter-spotting.

The video was shot by Nick Hope with a Sony HVR-Z1P HDV camera in a Light & Motion Bluefin HD housing with Light & Motion Elite lights and a flat port. A Century +3.5 diopter was used for the most of the macro footage.

I have more scuba diving videos and underwater footage on my website at:
http://www.bubblevision.com

I post updates about my videos here:
  / bubblevision  
http://google.com/+bubblevision
  / nicholashope  
  / bubblevision  

Full list of marine life and dive sites featured in this video:

00:00 Hypselodoris bullocki & Glossodoris cincta, Aer Perang
00:05 Doto sp., Nudi Retreat
00:10 Hypselodoris tryoni, Tanjung Kusu-Kusu
00:15 Hypselodoris maculosa, Critter Hunt
00:20 Nembrotha kubaryana, Nudi Falls
00:30 Hypselodoris tryoni, Tanjung Kusu-Kusu
00:37 Hypselodoris kanga, Aer Perang
00:43 Doriprismatica atromarginata, Nudi Falls
00:50 Glossodoris cincta, Aer Perang
01:08 Hypselodoris tryoni, Tanjung Kusu-Kusu
01:23 Nembrotha kubaryana, Nudi Falls
01:31 Chromodoris magnifica, Nudi Retreat
01:35 Chromodoris elisabethina, Bunaken
01:41 Chromodoris annae, Bunaken
01:47 Jorunna funebris, TK 2
02:09 Discodoris boholiensis, Two Fish Divers house reef
02:25 Mexichromis trilineata, Retak Larry
02:30 Hypselodoris kanga, Aer Perang
02:35 Nembrotha yonowae, Police Pier
02:40 Chromodoris annae, Tanjung Kusu-Kusu
02:53 Chromodoris elisabethina, Nudi Retreat
02:59 Chromodoris willani, Nudi Retreat
03:05 Chromodoris magnifica, Nudi Retreat
03:19 Ceratosoma gracillimum, TK 1
03:33 Ceratosoma tenue, Jahir
03:54 Banggai Cardinalfish, Pterapogon kauderni, Makawide
04:17 Ceratosoma trilbatum, Aer Perang
04:29 Phyllidiopsis shireenae, Tanjung Kusu-Kusu
04:35 Phyllidiopsis shireenae, Nudi Retreat
04:46 Phyllidia ocellata, Tanjung Kusu-Kusu
04:54 Phyllidiopsis cardinalis, Nudi Falls
05:10 Flabellina exoptata, Police Pier
05:20 Flabellina rubrolineata, Critter Hunt
05:31 Blue Dragon Nudibranch, Pteraeolidia semperi, Hairball
05:54 Blue Dragon Nudibranch, Pteraeolidia semperi, Police Pier
06:09 Blue Dragon Nudibranch, Pteraeolidia semperi, Hairball
06:34 Phyllodesmium crypticum, Retak Larry
07:04 Phyllodesmium crypticum, Hairball
07:12 Hypselodoris emma, Aer Perang